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AC 150/5300-4B 6/24/75 <br />17. CLEARANCE OVER HIGHWAYS AND RAILROADS. <br />a. Figure 5-2 shows the recommended minimum clearance for the ver- <br />tical distance between a railroad, highway, or traverse way and a <br />clearance surface. When the landing area of an airport is to be <br />extended or a new airport is to be constructed near a highway or <br />railroad, maintain adequate clearance between them. <br />b. It should be noted that the clearances shown in Figure 5-2 are <br />minimum. Attain greater clearance for future needs wherever <br />possible. Further avoid the location'of a traverse way of any type <br />within the building restriction line. If a small secondary road <br />is allowed to cross this area, it may be only a few years before <br />it is a primary highway with adjacent light standards, power lines, <br />and sign boards. <br />18. AIRPORT ZONING FOR HEIGHT RESTRICTION. <br />a. The purpose of airport obstruction zoning is to restrict the height <br />of objects in the vicinity of airports to prevent them from <br />interfering with the safe and efficient operation of the airport <br />and public investment therein. An airport zoning ordinance can be <br />an effective method of achieving this and also of generally <br />attaining compatibility of land use in the immediate vicinity of <br />the airport. The ordinance must conform to the prescribed authority <br />of the enabling act. <br />b. It has been recognized that guidance is needed in the preparation <br />of the zoning ordinance. To this end, Advisory Circular 150/5190-3, <br />Model Airport Hazard Zoning Ordinance has been published. The <br />model ordinance defines and provides for the establishment of <br />various zones prescribing height limitations for each zone as <br />required for the protection of the airport. Also in striving to <br />achieve compatible land uses, it is important to coordinate all <br />zoning closely with regional and local planning agencies. The <br />adoption of an airport zoning ordinance is considered a <br />necessary step in the planning and development of an airport. <br />19. LAND ACQUISITION. <br />a. The amount of land needed for any one of the three groups of <br />utility airports will vary considerably. Factors, such as length <br />and number of runways, lateral clearances, areas required for <br />buildings, hangars, aircraft tiedown, transient apron, automobile <br />parking, and future expansion of the airport should be studied in <br />detail, and a plan for the construction and expansion of the airport, <br />such as an airport layout plan, should be developed. <br />Page 16 <br />Chap 5 <br />Par 17 <br />